EPR studies of ion pairing in nematic butyl p-(p-ethoxyphenoxy carbonyl)—phenyl carbonate |
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Authors: | Michael P. Eastman Gerald V. Bruno Arturo R. Gutierrez Curtis A. McGuyer Carl F. Polnaszek |
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Affiliation: | Chemistry Department, University of Texas at El Paso, El Paso, Texas 79968, USA;Division of Biological Sciences, National Research Council, Ottawa, Canada K1A 0R6 |
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Abstract: | The potassium salt of tetracyanoethylene (KTCNE) has been dissolved in nematic butyl p-(p-ethoxyphenoxy carbonyl)—phenyl carbonate by itself and in the presence of the ionophores 18-crown-6, dibenzo-18-crown-6, cryptand 222, nonactin, and valinomycin. The EPR spectra obtained from the ionophore containing solutions indicate the following equilibrium IK+ + TCNE? ? (IK+ — TCNE?). Here I represents the ionophore and (IK+ — TCNE?) represents an ionophore complexed loose ion pair. A similar equilibrium occurs in the absence of the ionophore. In general for the (IK+— TCNE?) ion pair, the degree of orientational ordering and the magnitude of its temperature dependence decrease as the molecular weight of I increases. |
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